D-Link DGS-3308FG Product Manual - Page 192

BOOTP/DHCP Relay

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8-port Gigabit Ethernet Switch User's Guide Figure 7-48. Filter Address Setup screen Filter Address Table Items on the screen above include: • IP Address - The IP address that is to be filtered on the Switch. • Src/Dst - Select how you want packets to be dropped by the Switch. The options are: Dst - destination address, Scr - source address, and Either - either a destination or a source address. When Dst is chosen, packets with the above IP address as their destination will be dropped, When Scr is chosen, packets with the above IP address as their source will be dropped. When Either is chosen, all packets with the above IP address will be dropped by the Switch. The Filter Address Table • IP Address - Displays the IP address that is to be filtered on the Switch. • Src/Dst - Displays the state of the above IP address under which packets will be dropped by the Switch. The options are; Dst - destination address, Scr - source address, and Either - either a destination or a source address. • Delete - Click the icon to remove the entry from the filtering table. BOOTP/DHCP Relay BOOTP/DHCP relay enables end stations to use a BOOTP or DHCP server to obtain TCP/IP configuration information or boot files to be loaded into memory, even if the servers are not on the local IP interface. If the BOOTP or DHCP server and end station are on the same IP interface, no relay is necessary. If the servers and the end stations are on different IP interfaces, a relay agent is necessary for the switch to forward the messages. The relay agent forwards these packets between IP interfaces, and therefore must know the IP addresses of the BOOTP and DHCP servers and their respective subnet names (or IP interface names). When the Switch receives packets destined for a BOOTP or DHCP server, it forwards them to specific servers as defined in the following configuration. The Switch also forwards packets from the BOOTP or DHCP servers to the appropriate subnets. The first task is to set some parameters for the relay agent to decide whether or not to forward a given BOOTP/DHCP packet. 182

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8-port Gigabit Ethernet Switch User’s Guide
182
Figure 7-48.
Filter Address Setup screen
Filter Address Table
Items on the screen above include:
•
IP Address
– The IP address that is to be filtered on the Switch.
•
Src/Dst
– Select how you want packets to be dropped by the Switch. The options are:
Dst
– destination address,
Scr
– source address, and
Either
– either a destination or a source address. When
Dst
is chosen, packets with the
above IP address as their destination will be dropped, When
Scr
is chosen, packets with the above IP address as
their source will be dropped. When
Either
is chosen, all packets with the above IP address will be dropped by the
Switch.
The Filter Address Table
•
IP Address
– Displays the IP address that is to be filtered on the Switch.
•
Src/Dst
– Displays the state of the above IP address under which packets will be dropped by the Switch. The
options are;
Dst
– destination address,
Scr
– source address, and
Either
– either a destination or a source
address.
•
Delete
– Click the icon to remove the entry from the filtering table.
BOOTP/DHCP Relay
BOOTP/DHCP relay enables end stations to use a BOOTP or DHCP server to obtain TCP/IP configuration information or
boot files to be loaded into memory, even if the servers are not on the local IP interface.
If the BOOTP or DHCP server and end station are on the same IP interface, no relay is necessary. If the servers and the end
stations are on different IP interfaces, a relay agent is necessary for the switch to forward the messages.
The relay agent forwards these packets between IP interfaces, and therefore must know the IP addresses of the BOOTP
and DHCP servers and their respective subnet names (or IP interface names).
When the Switch receives packets destined for a BOOTP or DHCP server, it forwards them to specific servers as defined in
the following configuration. The Switch also forwards packets from the BOOTP or DHCP servers to the appropriate
subnets.
The first task is to set some parameters for the relay agent to decide whether or not to forward a given BOOTP/DHCP
packet.